Angular---can't bind to 'ngModel' since it isn't a know property of 'input'

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Angular2在双向数据绑定时，抛出如下问题：

can't bind to 'ngModel' since it isn't a know property of 'input'

解决办法：

在app.module.ts文件中，

import { FormsModule } from '@angular/forms';

向其应用模块@NgModule({})的imports:[]添加

FormsModule

具体如图所示：